b736052e39f1f466f63f261ace3dd2deba171e8a ci: always use tag for LLVM checkout (fanquake)
Pull request description:
Rather than trying to match the apt installed clang version, which is prone to intermittent issues. i.e #33345.
ACKs for top commit:
davidgumberg:
ACK b736052e39
willcl-ark:
ACK b736052e39f1f466f63f261ace3dd2deba171e8a
Tree-SHA512: 8e3fcc8219f573cec65941576c7995f21cae3330bcdbf615f799e8c5facd1146d3239a7284e9af7b013c37170ddf7435d7df6d2966f63fe7b4a8e4937311ff36